Improvement in saw-mill carriages



Patented Dec. 55,1871.

0. 121,664; shee s sheeu TITUS H. RUSSELL. improvement In Saw-MlCarriages.

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No121664. Patented Dec.5,\871.

Fry. 4.

'wnms I UNITED STATES PATENT QFFrcE.

TITUS H. RUSSELL, OF LEBANON, NEW HAMPSHIRE.

IMPROVEMENT IN SAW-MILL CARRIAGES.

Specification forming part of Letters Patent No. 121,664, dated December5, 1871.

To all whom it may concern:

Be it known that I, TI'rUs H. RUssELL, of Lebanon, in the county ofGrafton and State of New Hampshire, have invented an Improvement inSaw-M ill Carriages; and I do hereby declare that the following is afull and exact description thereof, reference being had to theaccompanying drawing making part of this specification Figure 1 being atop View of a saw-mill carriage provided with my improvement as locatedon its track; Fig.2, a rear elevation thereof; Fig. 3, a verticalcross-section of the same; Fig. 4, detached part thereof, represented insection.

Like letters designate corresponding parts in all of the figures.

The nature of my invention consists in a new and improved device formoving the set-beam either one way or the other, to any desired extent,by the forward andbackward motions of the carriage, substantially ashereinafter set forth.

Let A represent a saw-mill carriage; B, the track or ways on which itruns; 0 D D D, the headblock, tail-block, and other blocks thereof; andE, the set-beam, bearing the knees or uprights G G against which thelogs are dogged. The other parts of the saw-mill not necessarilyconnected with my invention are not shown in the drawing. In a suitableposition near the headblock of the carriage a screw, H, is mounted onthe carriage, at right angles to the same, and turns in bearings a a,secured to the side rails thereof. A similar screw, I, is in like mannermounted near the t. il block of the carriage. These screws turn infemale screws or nuts L L, fastened to the under side of the set-beam E,and they are alike, so that by turning the screws to an equal extentthey will move the two ends of the setbeam equally one way or the other,according to the direction in which the screws are turned. There arepinions M N of equal size on the rear ends of the two screws,respectively, gearing into other pinions O P on a longitudinalconnecting-shaft, Q, mounted on the back side of the carriage. Thisshaft secures an exactly equal turning of both screws, and consequentlya precisely equal movement of both ends of the set-beam at all times.Into one of the pinions O on the shaft Q gears another pinion orbevelwheel, R, on a short vertical shaft, S, mounted on the carriage. Onthis shaft also is secured a driving friction-pulley, T, by which thescrews H I are turned through the pinion-gearing and connecting-shaftabove described whenever and as much as desired. To effect the turningof this friction-pulley, as the carriage advances or recedes,substantially the following device is employed: In a proper position arelocated one, or preferably two, bearing-timbers or rails, U U, madestationary and situated so that one of their sides may be either incontact with the frictionpulley T or not as the latter passes by them,whether in the forward or backward movement of the carriage. To bringthese pressurerails into contact with the friction-pulley they arearranged as shownthat is, pivoted to stationary blocks or supports 1) b,and to each other at c-or otherwise arranged in an equivalent manner sothat they may be moved laterally into position of contact with thepulley, as shown by full lines in Fig. 1, and be pressed against thepulley with sufficient force to cause the same to revolve as thecarriage carries the latter along; or they may be moved out of contactwith or reach of the said pulley, as indicated by dotted lines in thesame figure. To produce this lateral movement of the frictionpressure-rails a lever, V, is located crosswise under the carriage-trackor floor of the mill, and is pivoted at (l to a fixed support. A bentarm, f, extends from one end of the lever upward to the pressure-rails,and is coupled thereto at g. From the other end of the lever an arm orrod, terminating in a pedal, h, extends up through the floor. By placinghis foot on this pedal and depressing that end of the lever the sawyercan press the rails inward, so as to be in contact with thefriction-pulley as it passes, with suflicient force to cause the same torevolve and turn the screws H I. The arrangement is such that when thecarriage is going forward the pressure of the rails against the pulleycauses the set beam to move toward the front side of the carriage, andwhen the carriage is moving backward the action of the rails on thepulley moves the set beam toward the back sidelof the carriage; or viceversa, if preferred. The length of the rail or rails may be such as tomove the set-beam the full extent of its lateral movement on thecarriage when the pulley runs in contact with the entire .length thereofbut when logs are set along an inch or two at a time, in setting off thethickness of boards, planks, or dimension-stulf, only a small portion ofthe length of the rails is to be brought into contact with the pulleyeach time-say ten inches of the length-4o set for an inch hoard. Thissetting may be done automatically and gauged to any thickness by meansof a gauge device attached to the same frame invented by me and to bemade the subject-matter of other Letters Patent which I purpose to applyfor.

The friction driving-roller T might be applied directly to one of thescrews H I; but there are objections to such an arrangement; and Ipret'er the arrangement substantially as above described.

What I claim as my invention, and desire to seem-e by Letters Patent,is-- The friction driving-rollerT and movable press nre-rail or rails U,acting in combination with the carriage B and set-beam E of a saw-mill,substantially as and for the purpose herein specified.

TITUS H. RUSSELL.

Witnesses:

E. J. DURANJ, U. V. COBB. (71)

